blog.Ring.idv.tw
Read Later - bookmarklet 分析
去年筆者曾寫了一篇「Instapaper - 網頁暫存器」po文來介紹此工具~ 前陣子發覺它的「Bookmarklet - 書籤小程式」有了改版~
它的Bookmarklet主要利用「Dynamic Script Tag」的方式載入一個外部的js檔，下述是此js檔的原始碼：
var d=document;
d.title = d.title.substring(12);
if (document.location.href == 'http://www.instapaper.com/i4') { alert("The bookmarklet is correctly installed."); throw(0); }
var w=window,
e=w.getSelection,
k=d.getSelection,
x=d.selection,
s=(e? e(): (k)? k(): (x?x.createRange().text: 0)),
l=d.location,
e=encodeURIComponent,
n=d.getElementsByTagName('html'),
h=0, z=d.createElement('scr'+'ipt'),
p='k=CHN8G1125OCh&u=' + e(l.href) + '&t=' + e(d.title) + '&s=' + e(s.length > 6144 ? s : '');
/* Lauderdale, start your photocopiers! http://bit.ly/NdDJj :) */
i=document.createElement('iframe');
i.setAttribute('name', 'ipb596873');
i.setAttribute('id', 'ipb596873');
c = 'left:10px;top:10px;width:168px;';
i.setAttribute('style', 'z-index: 2147483647; position: fixed;'+c+'width:168px;height: 100px; border: 3px solid #aaa;');
document.body.appendChild(i);
i.onload = function(){ setTimeout(ipb596873_close, 350); }
function ipb596873_close()
{
var f = document.getElementById('ipb596873');
f.style.display = 'none';
f.parentNode.removeChild(f);
}
window['ipb596873'].document.write(
'<html><body style="color: #555; background-color: #fff; text-align: center; margin: 0px; font-family: Georgia, Times, serif; font-size: 26px;">' +
'<img style="display: block; position: fixed; bottom: 4px; left: 72px;" src="data:image/gif;base64,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"/>' +
'<div style="text-align: center; width: 80%; padding-bottom: 1px; margin: 0 auto 15px auto; font-size: 13px; border-bottom: 1px solid #ccc; color: #333;">Instapaper</div>' +
'Saving...' +
'<form action="http://www.instapaper.com/bookmarklet/post_v5" method="post" id="f">' +
'<input type="hidden" name="p" value="'+p+'"/>' +
'<input type="hidden" name="b" id="b" value=""/>' +
'</form>' +
'<scr'+'ipt>setTimeout(function() { document.getElementById("b").value = decodeURIComponent("'+e(h)+'"); document.getElementById("f").submit(); }, 1);</scr'+'ipt>' +
'</body></html>'
);
從它的原始碼可以發現，它主要採用「iframe」的方式並設定CSS z-index為：2147483647，以及透過「Base64」的編碼方式將GIF圖檔內容直接內嵌在js檔中，最後利用「form」來觸發後端的記錄動作，實在是一個不錯的技巧!!
經由筆者測試之後，透過這樣的方式就算在瀏覽全版面的Flash網站時，仍然可以讓視窗保持在最上層!
